CN112649519B - Method for accurately and rapidly detecting pesticide residues in fruits - Google Patents
Method for accurately and rapidly detecting pesticide residues in fruits Download PDFInfo
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- CN112649519B CN112649519B CN202011017478.7A CN202011017478A CN112649519B CN 112649519 B CN112649519 B CN 112649519B CN 202011017478 A CN202011017478 A CN 202011017478A CN 112649519 B CN112649519 B CN 112649519B
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- 235000013399 edible fruits Nutrition 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000000447 pesticide residue Substances 0.000 title claims abstract description 31
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000000575 pesticide Substances 0.000 claims abstract description 69
- 239000002086 nanomaterial Substances 0.000 claims abstract description 53
- 239000007788 liquid Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 10
- 239000003480 eluent Substances 0.000 claims abstract description 8
- 230000018044 dehydration Effects 0.000 claims abstract description 6
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 76
- 239000000243 solution Substances 0.000 claims description 60
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 43
- 229910052681 coesite Inorganic materials 0.000 claims description 42
- 229910052906 cristobalite Inorganic materials 0.000 claims description 42
- 229910052682 stishovite Inorganic materials 0.000 claims description 42
- 229910052905 tridymite Inorganic materials 0.000 claims description 42
- 239000007787 solid Substances 0.000 claims description 25
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 22
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 21
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 239000003960 organic solvent Substances 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 15
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 14
- VQAOFEQEGKHRBC-UHFFFAOYSA-N 1,4-dibromo-2-(4-bromophenyl)benzene Chemical group C1=CC(Br)=CC=C1C1=CC(Br)=CC=C1Br VQAOFEQEGKHRBC-UHFFFAOYSA-N 0.000 claims description 13
- CTENFNNZBMHDDG-UHFFFAOYSA-N Dopamine hydrochloride Chemical compound Cl.NCCC1=CC=C(O)C(O)=C1 CTENFNNZBMHDDG-UHFFFAOYSA-N 0.000 claims description 13
- 239000007983 Tris buffer Substances 0.000 claims description 13
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 12
- 229960001149 dopamine hydrochloride Drugs 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000002077 nanosphere Substances 0.000 claims description 7
- 238000011068 loading method Methods 0.000 claims description 6
- 239000002122 magnetic nanoparticle Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 235000021016 apples Nutrition 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- 238000010828 elution Methods 0.000 claims description 2
- 244000141359 Malus pumila Species 0.000 claims 1
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 12
- 150000001875 compounds Chemical class 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 abstract description 2
- 239000012224 working solution Substances 0.000 description 23
- 229920001690 polydopamine Polymers 0.000 description 22
- 150000002500 ions Chemical class 0.000 description 19
- 238000001514 detection method Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 16
- 238000001179 sorption measurement Methods 0.000 description 12
- 238000011084 recovery Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 8
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical group C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000004005 microsphere Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 241000220225 Malus Species 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000003987 organophosphate pesticide Substances 0.000 description 4
- 238000000611 regression analysis Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000013305 food Nutrition 0.000 description 3
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002728 pyrethroid Substances 0.000 description 3
- 238000012421 spiking Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 206010008428 Chemical poisoning Diseases 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229960003638 dopamine Drugs 0.000 description 2
- 235000012055 fruits and vegetables Nutrition 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 125000001165 hydrophobic group Chemical group 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000012086 standard solution Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- YVGGHNCTFXOJCH-UHFFFAOYSA-N DDT Chemical compound C1=CC(Cl)=CC=C1C(C(Cl)(Cl)Cl)C1=CC=C(Cl)C=C1 YVGGHNCTFXOJCH-UHFFFAOYSA-N 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- JLYXXMFPNIAWKQ-GNIYUCBRSA-N gamma-hexachlorocyclohexane Chemical compound Cl[C@H]1[C@H](Cl)[C@@H](Cl)[C@@H](Cl)[C@H](Cl)[C@H]1Cl JLYXXMFPNIAWKQ-GNIYUCBRSA-N 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229960002809 lindane Drugs 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- NNKVPIKMPCQWCG-UHFFFAOYSA-N methamidophos Chemical compound COP(N)(=O)SC NNKVPIKMPCQWCG-UHFFFAOYSA-N 0.000 description 1
- 238000002414 normal-phase solid-phase extraction Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 210000004911 serous fluid Anatomy 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
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Abstract
The invention discloses a method for accurately detecting pesticide residues in fruits, which comprises the following steps: (1) Homogenizing fruits with a homogenizer, adding water and acetonitrile for dispersion; (2) putting the magnetic nano material into the container to perform continuous oscillation extraction; (3) Separating the magnetic nano material for extracting and adsorbing the pesticide from the fruit solution by using a magnet; (4) Ultrasonically eluting the pesticide adsorbed by the magnetic nano material by using a small amount of organic reagent, and adding anhydrous sodium sulfate into eluent for dehydration; (5) adding an internal standard compound solution; (6) And analyzing and detecting the liquid to be detected by using a gas chromatograph-mass spectrometer. The method for accurately detecting the pesticide residue in the fruits has the advantages of short operation time, less consumption of organic reagents, low analysis cost, accurate analysis result and easy popularization.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method for accurately and quickly detecting pesticide residues in fruits.
Background
Along with the rapid growth of economy in China and the improvement of the living standard of people, the production and consumption of fruits are rapidly increased year by year. In order to meet the product yield and prolong the quality guarantee period, the fruit growers use pesticides and other preservatives in the production process to achieve the maximization of economic benefit. With the limited use of organic chlorine pesticides such as dichlorodiphenyl trichloroethane, hexachloro cyclohexane and the like and highly toxic methamidophos in China, the common pesticides used by fruit growers at present mainly comprise other organophosphorus with relatively weak toxicity and pyrethroid pesticides with medium and low toxicity. The output of the organophosphorus pesticide in China accounts for one third of the total quantity all over the world, and the output of the organophosphorus pesticide accounts for more than half of the total quantity of the pesticides in China. The two types of pesticides have good stability and relatively long residual period, if the nonstandard phenomenon exists in the using and picking processes, the residual quantity of the pesticides in fruits is easy to exceed the standard, pesticide poisoning events caused by the pesticide poisoning events and disputes caused in regional agricultural product trades occur, the harm of pesticide residues to human bodies is controlled, one of the most effective methods is to enhance the detection strength of the pesticides in the fruits, meet the requirements of 'maximum residual quantity of pesticides in national standard food for food safety GB 2763-2019', and fully guarantee the edible safety of consumers. In order to detect and analyze various pesticide residues in fruits, currently, widely applied national standard methods include GB/T5009.218-2008 for determining pesticide residues in fruits and vegetables, GB 23200.8-2016 for determining residues of 500 pesticides and related chemicals in fruits and vegetables, which are national standards for food safety, and GC-NY mass spectrometry/T1380-2007 for determining residues of 51 pesticides in vegetables and fruits, which provide a very reliable detection method for pesticide residues in fruits. However, in the practical implementation process, on one hand, the pretreatment method provided by the national standard needs to use a large amount of high-purity organic reagents which inevitably cause health hazards to the experimenters; on the other hand, various solid phase adsorption columns with high price are required to be used, and the reagents and the columns have to be properly treated after being used; in particular, the whole pretreatment process has the defects of multiple steps, long time, time and labor waste, relatively low recovery rate, high cost and the like. Although the patented technology is optimized in sample pretreatment, high-end instruments such as an ultra-high performance liquid chromatography-tandem triple quadrupole mass spectrometer and the like which are expensive, high in maintenance and use cost are required in the detection process, and the patented technology is difficult to popularize quickly in a short time. Therefore, a rapid, economic, efficient, green and environment-friendly pretreatment method combined with an easily-popularized detection technology must be developed to perform rapid and accurate qualitative and quantitative analysis on various pesticide residues in fruits.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for accurately measuring various pesticide residues in fruits by using a simple one-dimensional gas chromatography-mass spectrometer. The method can solve the technical problem of providing a simpler, efficient, accurate and green method for measuring various residual pesticides in fruits.
The technical problem to be solved by the invention is realized by the following technical scheme:
the invention relates to a method for accurately detecting pesticide residues in fruits, which comprises the following steps:
(1) Homogenizing fruits with a homogenizer, adding water and acetonitrile for dispersion;
(2) Adding magnetic nano materials for continuous oscillation extraction;
(3) Separating the magnetic nano material for extracting and adsorbing the pesticide from the fruit solution by using a magnet;
(4) Ultrasonically eluting the pesticide adsorbed by the magnetic nano material by adopting a small amount of organic reagent to obtain eluent, adding anhydrous sodium sulfate, dehydrating and concentrating;
(5) Adding an internal standard compound solution to obtain a solution to be detected;
(6) And analyzing and detecting the liquid to be detected by using a gas chromatography-mass spectrometer.
Specifically, the accurate method for simultaneously detecting the pesticides in the fruits comprises the following steps:
(1) Homogenizing 20-50 g of fruits by a homogenizer to obtain a serous fluid; taking 10-20 g of slurry into a 50-100 mL centrifuge tube with a plug, then adding 10-40 mL of deionized water and 3-5 mL of acetonitrile, and shaking for 2-4 minutes;
(2) Adding 50-200 mg of magnetic nano material into the centrifuge tube with the plug in the step (1), and continuing to vibrate for 5-10 minutes;
(3) Placing a magnet on the side wall of a centrifuge tube, fully adsorbing the pesticide in the fruit solution by the magnetic nano material, adsorbing the magnetic nano material on the side wall close to the magnet, discarding the mixed liquid of acetonitrile and water of the fruit, cleaning the magnetic nano material for 2-3 times by deionized water, and discarding the cleaning liquid;
(4) And (3) ultrasonically eluting the magnetic nano material in the centrifuge tube with the plug for 5-10 minutes by adopting 2-5 mL of organic solvent, eluting the pesticide adsorbed by the magnetic nano particles into the organic solvent to obtain eluent, adding 100-300 mg of anhydrous sodium sulfate, dehydrating and concentrating. Wherein the organic solvent is acetonitrile and methanol in a volume ratio of (3-4): 1;
(5) Adding an internal standard 2,4', 5-tribromobiphenyl solution to obtain a solution to be detected;
(6) And (3) loading the fruit to be tested, analyzing the liquid to be tested by using a gas chromatography-mass spectrometer, and performing qualitative and quantitative calculation by using an internal standard working curve method to obtain an accurate determination result of the pesticide residue in the fruit.
Preferably, the dosage of the deionized water for washing the magnetic nano material in step (3) is 1-3 mL.
Preferably, the magnetic nano material in the step (2) is Fe3O4@SiO2The material is a magnetic nano material of @ PDA @ StVp, wherein the PDA is polydopamine, and the StVp is a copolymer with the surface wrapped by pyrrolidone and styrene.
Said Fe3O4@SiO2The specific synthesis process of the @ PDA @ StVp magnetic nano material is as follows:
s1, weighing dopamine hydrochloride and Tris buffer solution with the molar concentration of 10mM, and mixing the weighed dopamine hydrochloride and Tris buffer solution in a solid-to-liquid ratio of 1: (0.8-1.2) mg/mL;
s2 weighing Fe3O4@SiO2Magnetic nanospheres, according to Fe3O4@SiO2And the dopamine hydrochloride Tris buffer solution has a mass ratio of 1: (4-5) adding;
s3, weighing n-vinyl pyrrolidone according to Fe3O4@SiO2And n-vinyl pyrrolidone in a mass ratio of 1: (3-5) adding;
s4, weighing styrene according to Fe3O4@SiO2And styrene in a mass ratio of 1: (1-2) adding;
s5, mechanically stirring the solution at room temperature at the speed of 100-400 rpm for 1-2 hours; then reacting for 8-12 hours at the temperature of 60-120 ℃;
s6, after the reaction is finished, centrifuging the reaction solution for 10-15 minutes at 2000-3000 r/min, and collecting the bottom solid;
s7, respectively washing the bottom solid by using absolute ethyl alcohol with the weight 50-70 times that of the bottom solid and deionized water with the weight 100-200 times that of the bottom solid;
s8, adding the solid intoDrying for 6-10 hours at 50-70 ℃ and under the vacuum degree of 0.07-0.09 MPa to obtain the Fe3O4@SiO2@ PDA @ StVp magnetic nano material.
By reaction at Fe3O4@SiO2The magnetic nano-microspheres are modified by PDA and StVp at the same time, the magnetic microspheres modified with hydrophilic group PDA can be fully dispersed in water, and the PDA group has excellent adsorption capacity for polar pesticide compounds, and after the StVp is modified, the hydrophobic group (benzene ring) of the material can more effectively enrich the pesticide compounds with weak polarity and benzene ring in fruit solution through pi-pi acting force and hydrophobic-hydrophobic acting force. Particularly, PDA and StVp are modified simultaneously, the amido of dopamine and the carbonyl of n-vinyl pyrrolidone can react to produce a frame structure similar to network channels, the frame structure has an ordered open pore channel and a core-shell structure, the specific surface area of the material is obviously improved, and correspondingly, the characteristics can obviously improve the effects of selectivity, strong adsorption, efficient enrichment, rapid separation and cyclic utilization of the material on pesticide residues. Experimental results show that the composite structure modification can obviously improve the dispersion performance, the magnetic performance and the adsorption performance of the magnetic material to pesticides with different properties, and obviously improve the adsorption capacity of the material to various pesticides with different properties.
Compared with the prior art, the invention has the advantages that: the pesticide residue in the fruit is pretreated by the magnetic solid phase extraction method, so that the treatment time and the treatment cost can be greatly reduced, and Fe is subjected to the pretreatment3O4@SiO2The magnetic nano-microspheres are modified by PDA and StVp at the same time, so that ordered open pore channels are provided, the adsorption performance of the material is obviously improved, and the adsorption efficiency of the material to pesticides with different properties is enhanced; the conventional gas chromatography-mass spectrometer is adopted for measurement, so that the method is easy to popularize and popularize, and the measurement is quicker and more accurate in qualitative determination. Generally, the method is quick, economic, efficient and accurate, and the adverse effects of the traditional test method on personnel and environment are greatly reduced.
The specific information of the reagents used is as follows:
33 pesticide standards purchased from Sigma-aldrich Sigma aldrich trade ltd, both at 100 μ g/mL solvent for toluene and acetone;
an internal standard solution, 2,4', 5-tribromobiphenyl, CAS number 59080-36-3, purchased from sepuclco, usa, at an initial concentration of 1000 μ g/mL and with acetonitrile as solvent;
the pesticide matrix mixed standard working solution is prepared by respectively adding a certain amount of mixed standard solution and an internal standard 2,4', 5-tribromobiphenyl solution into 1.0mL of sample blank matrix extracting solution, and uniformly mixing to prepare the matrix mixed standard working solution. The matrix mixed standard working solution should be prepared as it is.
Acetonitrile, CAS No.: 75-05-8, analytically pure, purchased from Shanghai pharmaceutical chemical reagents, inc.;
methanol, CAS No.: 67-56-1, analytically pure, available from Shanghai national Chemicals, inc.;
absolute ethanol, CAS No.: 64-17-5, analytically pure, available from Shanghai national Chemicals, inc.;
ammonia, CAS No.: 7647-01-0, analytically pure, from Shanghai pharmaceutical chemical reagents, inc.;
hydrochloric acid solution, CAS No.: 7664-41-7, analytically pure, from Shanghai national Chemicals GmbH;
ethylene glycol, CAS No.: 107-21-1, analytically pure, available from Shanghai pharmaceutical chemical reagents, inc.;
sodium acetate CH3COONa·3H2O, CAS number: 127-09-3, analytically pure, available from Shanghai pharmaceutical Chemicals, inc.;
anhydrous sodium sulfate Na2SO4CAS number: 7757-82-6: analytically pure, purchased from Shanghai national chemical reagent, inc., burned at 650 deg.C for 4h before use, stored in a drier, and cooled for use;
Fe3O4@SiO2magnetic sphere, CAS No.: 1317-61-9, available from Nanjing Xiancheng nanomaterial science and technology Limited;
dopamine hydrochloride, CAS number: 62-31-7, available from Afaha chemical Co., ltd;
tris buffer of 10mM concentration, namely Tris (Tris hydroxymethyl aminomethane) buffer of 10mM concentration, available from Nantong moist chemical Co., ltd;
n-vinyl pyrrolidone, CAS No.: 88-12-0, shanghai national chemical reagents, inc.;
styrene, CAS No.: 100-42-5, shanghai pharmaceutical chemical Co., ltd.
The instruments, equipment and conditions used in the detection process were as follows:
a refiner, provided by Shanghai Bilang instruments manufacturing Limited, model number BILON;
a vortex oscillator provided by Wuxi Voxin instruments Inc. with model number XH-B;
the electronic balance is provided by Shenzhen light balance instrument Limited and has the model of XS105DU;
an automatic concentrator, model 6 DryVap, supplied by Leiberttaco instruments, beijing.
Agilent 6893/5975 gas chromatography/mass spectrometer equipped with an electron bombardment source (EI).
A chromatographic column: HP-5MS quartz capillary column, 30m0.25mm, 0.25 μm
Chromatographic conditions are as follows: column temperature: the initial temperature is 60 ℃, and the temperature is kept for 1min; raising the temperature to 150 ℃ at a speed of 30 ℃/min, and keeping the temperature for 1min; then the temperature is increased to 300 ℃ at the speed of 10 ℃/min and kept for 10min.
The temperature of a sample inlet is 250 ℃;
carrier gas: he (> 99.999%), flow rate: 1mL/min;
and (3) sample introduction mode: no-shunt sample introduction; sample introduction amount: 1 mu L of the solution;
mass spectrum conditions: ionization mode EI, ionization energy 70eV, and ion source temperature 250 ℃; quadrupole temperature: 150 ℃; the scanning mode is as follows: ion scans were selected, and the specific scan information is shown in table 1:
TABLE 1 name of pesticide tested and retention time and qualitative and quantitative ion information
The method for accurately detecting the pesticide residue in the fruits has the advantages of short operation time, low consumption of organic reagents, low analysis cost, high recovery rate, low detection limit, accurate quantitative analysis result, easiness in popularization and the like.
Detailed Description
The present invention is further illustrated by the following examples, but the present invention is not limited to the following examples.
The magnetic nano material Fe3O4@SiO2The Nanjing Xiancheng nanomaterial technology Co., ltd is purchased.
Example 1
A method for accurately detecting pesticide residues in fruits comprises the following steps:
(1) Homogenizing 20g of apples with a homogenizer at 9500 rpm for 1 minute to obtain a slurry; taking 5g of slurry in a 50mL centrifuge tube with a plug, then adding 20mL of deionized water and 2mL of acetonitrile, and shaking at 1800 rpm for 2 minutes;
(2) Adding 50mg of magnetic nano material into the centrifuge tube with the plug in the step (1), and continuing shaking at 1800 rpm for 4 minutes;
(3) Placing a magnet on the side wall of a centrifuge tube, fully adsorbing pesticides in fruits by using a magnetic nano material, adsorbing the magnetic nano material on the side wall close to the magnet, discarding a mixed solution of the fruits, acetonitrile and water, cleaning the magnetic nano material for 3 times by using 2mL of deionized water each time, and discarding a cleaning solution;
(4) Carrying out ultrasonic elution on the magnetic nano material in the centrifuge tube with the plug by adopting 4mL of organic solvent for 8 minutes under the conditions of ultrasonic power of 300W and ultrasonic frequency of 25kHz, eluting the pesticide adsorbed by the magnetic nano particles into the organic solvent, adding 200mg of anhydrous sodium sulfate for dehydration, and then concentrating the eluent to 1mL on an automatic concentrator; wherein the organic solvent is acetonitrile/methanol in a volume ratio of 3: 1;
(5) Adding an internal standard 2,4', 5-tribromobiphenyl solution which is equivalent to 0.20mg/kg of a sample to obtain a solution to be detected;
(6) And (3) loading the fruit to be tested, analyzing the liquid to be tested by using a gas chromatograph-mass spectrometer, and performing qualitative and quantitative calculation by using an internal standard working curve method to obtain an accurate determination result of the pesticide residue in the fruit.
The magnetic nano material is Fe3O4@SiO2。
Preparing a standard working solution: taking a proper amount of each pesticide standard, and preparing 7 concentration points of standard working solution in the concentration range of 0.03-1.00 mg/kg in 5g of sample by using acetonitrile extracting solution of blank matrix, wherein the internal standard 2,4', 5-tribromobiphenyl solution which is the same as the sample is added into each concentration point.
In the detection process, an automatic sampler is adopted for sample injection, the sample injection volume is 1 mu L, qualitative and quantitative determination is carried out by adopting an internal standard working curve method, and results of 37 pesticide residues in fruits are obtained by calculation. Performing gas chromatography/mass spectrometry combined instrument measurement on the standard working solution with each concentration gradient, and performing regression analysis on the corresponding concentration of the standard working solution according to the chromatographic peak area ratio of the quantitative ions and the internal standard characteristic ions of each pesticide in the standard working solution to obtain a standard working curve; and (5) determining the liquid to be detected in the step (4) under the same condition, measuring the quantitative ion chromatographic peak area of the 37 pesticides in the liquid to be detected and the peak area ratio of the internal standard characteristic ion, substituting into the standard curve to obtain the content of the 37 pesticides in the liquid to be detected, and then calculating according to the mass of the sample represented by the liquid to be detected to obtain the residual quantity of the 37 pesticides in the sample.
The detection indexes are shown in table 2.
Table 2 names of pesticides tested, limits of testing, linear range, linear correlation coefficient, normalized recovery and relative standard deviation.
Example 2
A method for accurately detecting pesticide residues in fruits comprises the following steps:
(1) Homogenizing 20g of apples with a homogenizer at 9500 rpm for 1 minute to obtain a slurry; taking 5g of slurry in a 50mL centrifuge tube with a plug, then adding 20mL of deionized water and 2mL of acetonitrile, and shaking at 1800 rpm for 2 minutes;
(2) Adding 50mg of magnetic nano material into the centrifuge tube with the plug in the step (1), and continuing shaking at 1800 rpm for 4 minutes;
(3) Placing a magnet on the side wall of a centrifuge tube, fully adsorbing the pesticide in the fruit by the magnetic nano material, adsorbing the magnetic nano material with magnetism on the side wall close to the magnet, discarding the mixed solution of the fruit, acetonitrile and water, cleaning the magnetic nano material for 3 times by 2mL of deionized water each time, and discarding the cleaning solution;
(4) Ultrasonically eluting the magnetic nano material in the centrifuge tube with the plug by adopting 4mL of organic solvent under the conditions of ultrasonic power of 300W and ultrasonic frequency of 25kHz for 8 minutes, eluting the pesticide adsorbed by the magnetic nano particles into the organic solvent, adding 200mg of anhydrous sodium sulfate for dehydration, and then concentrating the eluent to 1mL on an automatic concentrator; wherein the organic solvent is acetonitrile/methanol in a volume ratio of 3: 1;
(5) Adding an internal standard 2,4', 5-tribromobiphenyl solution which is equivalent to 0.20mg/kg of a sample to obtain a solution to be detected;
(6) And (3) loading the fruit to be tested, analyzing the liquid to be tested by using a gas chromatograph-mass spectrometer, and performing qualitative and quantitative calculation by using an internal standard working curve method to obtain an accurate determination result of the pesticide residue in the fruit.
The magnetic nano material is Fe3O4@SiO2@ PDA, the specific synthetic process is as follows:
s1, weighing dopamine hydrochloride and Tris buffer solution with the molar concentration of 10mM, and mixing the weighed dopamine hydrochloride and Tris buffer solution in a solid-to-liquid ratio of 1: mixing at 0.8 mg/mL;
s2 weighing Fe3O4@SiO2Magnetic nanospheres, according to Fe3O4@SiO2And the dopamine hydrochloride Tris buffer solution in a mass ratio of 1:8, adding;
s3, stirring the solution at 30 ℃ at 300 revolutions per minute for 1 hour; then reacting for 8 hours at the temperature of 80 ℃;
s4, after the reaction is finished, centrifuging the reaction solution at 2000 rpm for 15 minutes, and collecting a bottom solid;
s5, respectively washing the bottom solid by using absolute ethyl alcohol with the weight 50 times that of the bottom solid and deionized water with the weight 100 times that of the bottom solid;
s6, drying the solid for 6 hours at the temperature of 50 ℃ and the vacuum degree of 0.09MPa to obtain the Fe3O4@SiO2@ PDA magnetic nanomaterial.
Preparing a standard working solution: taking a proper amount of each pesticide standard, and preparing 7 concentration points of standard working solution in the concentration range of 0.03-1.00 mg/kg in 5g of sample by using acetonitrile extracting solution of blank matrix, wherein the internal standard 2,4', 5-tribromobiphenyl solution which is the same as the sample is added into each concentration point.
In the detection process, an automatic sampler is adopted for sampling, the sampling volume is 1 mu L, qualitative and quantitative determination is carried out by adopting an internal standard working curve method, and results of 37 pesticide residues in fruits are obtained by calculation. Performing gas chromatography/mass spectrometer measurement on the standard working solution with each concentration gradient, and performing regression analysis on the corresponding concentration of the standard working solution according to the chromatographic peak area ratio of the quantitative ions and the internal standard characteristic ions of each pesticide in the standard working solution to obtain a standard working curve; and (5) determining the liquid to be detected in the step (4) under the same condition, measuring the quantitative ion chromatographic peak area of the 37 pesticides in the liquid to be detected and the peak area ratio of the internal standard characteristic ion, substituting into the standard curve to obtain the content of the 37 pesticides in the liquid to be detected, and then calculating according to the mass of the sample represented by the liquid to be detected to obtain the residual quantity of the 37 pesticides in the sample.
The detection indexes are shown in table 3.
Table 3 name of pesticide tested, limit of detection, linear range, linear correlation coefficient, recovery from spiking, and relative standard deviation.
Example 3
A method for accurately detecting pesticide residues in fruits comprises the following steps:
(1) Homogenizing 20g of apples with a homogenizer at 9500 rpm for 1 minute to obtain a slurry; taking 5g of slurry in a 50mL centrifuge tube with a plug, then adding 20mL of deionized water and 2mL of acetonitrile, and shaking at 1800 rpm for 2 minutes;
(2) Adding 50mg of magnetic nano material into the centrifuge tube with the plug in the step (1), and continuing shaking at 1800 rpm for 4 minutes;
(3) Placing a magnet on the side wall of a centrifuge tube, fully adsorbing the pesticide in the fruit by the magnetic nano material, adsorbing the magnetic nano material with magnetism on the side wall close to the magnet, discarding the mixed solution of the fruit, acetonitrile and water, cleaning the magnetic nano material for 3 times by 2mL of deionized water each time, and discarding the cleaning solution;
(4) Ultrasonically eluting the magnetic nano material in the centrifuge tube with the plug by adopting 4mL of organic solvent under the conditions of ultrasonic power of 300W and ultrasonic frequency of 25kHz for 8 minutes, eluting the pesticide adsorbed by the magnetic nano particles into the organic solvent, adding 200mg of anhydrous sodium sulfate for dehydration, and then concentrating the eluent to 1mL on an automatic concentrator; wherein the organic solvent is acetonitrile/methanol in a volume ratio of 3: 1;
(5) Adding an internal standard 2,4', 5-tribromobiphenyl solution which is equivalent to 0.20mg/kg of a sample to obtain a solution to be detected;
(6) And (3) loading the fruit to be tested, analyzing the liquid to be tested by using a gas chromatograph-mass spectrometer, and performing qualitative and quantitative calculation by using an internal standard working curve method to obtain an accurate determination result of the pesticide residue in the fruit.
The magnetic nano material is Fe3O4@SiO2@ StVp, the specific synthetic process is as follows:
s1, weighing n-vinyl pyrrolidone according to Fe3O4@SiO2And n-vinyl pyrrolidone in a mass ratio of 1:6 is added;
s2, weighing styrene according to Fe3O4@SiO2And styrene and a mass ratio of 1:2 is added;
s3, stirring the solution at 30 ℃ for 1 hour at 300 revolutions per minute; then reacting for 8 hours at the temperature of 80 ℃;
s4, after the reaction is finished, centrifuging the reaction solution at 2000 rpm for 15 minutes, and collecting a bottom solid;
s5, respectively washing the bottom solid by using absolute ethyl alcohol with the weight 50 times that of the bottom solid and deionized water with the weight 100 times that of the bottom solid;
s6, drying the solid for 6 hours at the temperature of 50 ℃ under the vacuum degree of 0.09MPa to obtain the Fe3O4@SiO2@ StVp magnetic nanomaterial.
Preparing a standard working solution: taking a proper amount of each pesticide standard, preparing standard working solution with 7 concentration points in the concentration range of 0.03-1.00 mg/kg in 5g of samples by using acetonitrile extracting solution of blank matrix, and adding an internal standard 2,4', 5-tribromobiphenyl solution which is the same as the samples at each concentration point.
In the detection process, an automatic sampler is adopted for sample injection, the sample injection volume is 1 mu L, qualitative and quantitative determination is carried out by adopting an internal standard working curve method, and results of 37 pesticide residues in fruits are obtained by calculation. Performing gas chromatography/mass spectrometry combined instrument measurement on the standard working solution with each concentration gradient, and performing regression analysis on the corresponding concentration of the standard working solution according to the chromatographic peak area ratio of the quantitative ions and the internal standard characteristic ions of each pesticide in the standard working solution to obtain a standard working curve; and (4) measuring the liquid to be measured in the step (4) under the same conditions, measuring the quantitative ion chromatographic peak area of the 37 pesticides in the liquid to be measured and the peak area ratio of the internal standard characteristic ion, substituting the peak area ratio into the standard curve to obtain the content of the 37 pesticides in the liquid to be measured, and calculating according to the mass of the sample represented by the liquid to be measured to obtain the residual quantity of the 37 pesticides in the sample.
The detection indexes are shown in table 4.
Table 4 name of pesticide tested, limit of detection, linear range, linear correlation coefficient, recovery from spiking, and relative standard deviation.
Example 4 a method for accurately detecting pesticide residues in fruits, consisting of the following steps:
(1) Homogenizing 20g of apples with a homogenizer at 9500 rpm for 1 minute to obtain a slurry; taking 5g of slurry in a 50mL centrifuge tube with a plug, then adding 20mL of deionized water and 2mL of acetonitrile, and shaking at 1800 rpm for 2 minutes;
(2) Adding 50mg of magnetic nano material into the centrifuge tube with the plug in the step (1), and continuing shaking at 1800 rpm for 4 minutes;
(3) Placing a magnet on the side wall of a centrifuge tube, fully adsorbing pesticides in fruits by using a magnetic nano material, adsorbing the magnetic nano material on the side wall close to the magnet, discarding a mixed solution of the fruits, acetonitrile and water, cleaning the magnetic nano material for 3 times by using 2mL of deionized water each time, and discarding a cleaning solution;
(4) Ultrasonically eluting the magnetic nano material in the centrifuge tube with the plug by adopting 4mL of organic solvent under the conditions of ultrasonic power of 300W and ultrasonic frequency of 25kHz for 8 minutes, eluting the pesticide adsorbed by the magnetic nano particles into the organic solvent, adding 200mg of anhydrous sodium sulfate for dehydration, and then concentrating the eluent to 1mL on an automatic concentrator; wherein the organic solvent is acetonitrile/methanol in a volume ratio of 3: 1;
(5) Adding an internal standard 2,4', 5-tribromobiphenyl solution which is equivalent to 0.20mg/kg of a sample to obtain a solution to be detected;
(6) And (3) loading the fruit to be tested, analyzing the liquid to be tested by using a gas chromatography-mass spectrometer, and performing qualitative and quantitative calculation by using an internal standard working curve method to obtain an accurate determination result of the pesticide residue in the fruit.
The magnetic nano material is Fe3O4@SiO2@ PDA @ StVp, the specific synthesis process is as follows:
s1, weighing dopamine hydrochloride and Tris buffer solution with the molar concentration of 10mM, and mixing the weighed dopamine hydrochloride and Tris buffer solution in a solid-to-liquid ratio of 1: mixing at 0.8 mg/mL;
s2 weighing Fe3O4@SiO2Magnetic nanospheres, according to Fe3O4@SiO2And the dopamine hydrochloride Tris buffer solution in a mass ratio of 1:4 proportion of Fe3O4@SiO2In the above solution;
s3, weighing n-vinyl pyrrolidone according to Fe3O4@SiO2And n-vinylpyrrolidone in a mass ratio of 1:3 is added;
s4, weighing styrene according to Fe3O4@SiO2And styrene in a mass ratio of 1:1 is added;
s5, stirring the solution at 30 ℃ at 300 revolutions per minute for 1 hour; then reacting for 8 hours at the temperature of 80 ℃;
s6, after the reaction is finished, centrifuging the reaction solution at 2000 rpm for 15 minutes, and collecting a bottom solid;
s7, respectively washing the bottom solid by using absolute ethyl alcohol with the weight 50 times that of the bottom solid and deionized water with the weight 100 times that of the bottom solid;
s8, drying the solid for 6 hours at the temperature of 50 ℃ and the vacuum degree of 0.09MPa to obtain the Fe3O4@SiO2@ PDA @ StVp magnetic nanomaterial.
Preparing a standard working solution: taking a proper amount of each pesticide standard, preparing standard working solution with 7 concentration points in the concentration range of 0.03-1.00 mg/kg in 5g of samples by using acetonitrile extracting solution of blank matrix, and adding an internal standard 2,4', 5-tribromobiphenyl solution which is the same as the samples at each concentration point.
In the detection process, an automatic sampler is adopted for sample injection, the sample injection volume is 1 mu L, qualitative and quantitative determination is carried out by adopting an internal standard working curve method, and results of 37 pesticide residues in fruits are obtained by calculation. Performing gas chromatography/mass spectrometry combined instrument measurement on the standard working solution with each concentration gradient, and performing regression analysis on the corresponding concentration of the standard working solution according to the chromatographic peak area ratio of the quantitative ions and the internal standard characteristic ions of each pesticide in the standard working solution to obtain a standard working curve; and (4) measuring the liquid to be measured in the step (4) under the same conditions, measuring the quantitative ion chromatographic peak area of the 37 pesticides in the liquid to be measured and the peak area ratio of the internal standard characteristic ion, substituting the peak area ratio into the standard curve to obtain the content of the 37 pesticides in the liquid to be measured, and calculating according to the mass of the sample represented by the liquid to be measured to obtain the residual quantity of the 37 pesticides in the sample.
The detection indexes are shown in table 5.
Table 5 name of pesticide tested, limit of detection, linear range, linear correlation coefficient, recovery from spiking, and relative standard deviation.
Comparison of 4 application examples, example 1 with Fe directly3O4@SiO2Magnetic nanospheres, which are not modified; example 2 the material used was a single modified Fe3O4@SiO2@ PDA magnetic nano-microspheres; example 3 the material used was a single modified Fe3O4@SiO2@ StVp magnetic nanospheres; example 4 the material used was composite modified Fe3O4@SiO2The conditions were completely the same except for the @ PDA @ StVp magnetic nanospheres. Comparing the normalized recovery rates of the 4 examples, it can be seen that the overall recovery rate index is the lowest in example 1, and in contrast, the recovery rate of the pyrethroid pesticide in example 2 is significantly lower than that in example 3, the recovery rate of the organophosphorus pesticide in example 3 is significantly lower than that in example 2, and the recovery rates of the organophosphorus pesticide and the pyrethroid pesticide in example 4 are much higher than those in examples 2 and 3, which indicates that the composite modified Fe used in the present invention is3O4@SiO2The material of @ PDA @ StVp can obviously improve Fe3O4@SiO2@ PDA and Fe3O4@SiO2The two single modification materials of @ StVp have insufficient adsorption performance on pesticides with different properties.
By adding Fe3O4@SiO2The magnetic nano-microspheres are modified by PDA and StVp at the same time, the magnetic microspheres modified with hydrophilic groups PDA can be fully dispersed in water, and the PDA groups have excellent adsorption capacity for polar pesticide compounds, and after the StVp is modified, the hydrophobic groups (benzene rings) of the material can effectively enrich the weak-polar pesticide compounds in fruit solutions and the pesticide compounds containing the benzene rings through pi-pi acting force and hydrophobic-hydrophobic acting force. Particularly, PDA and StVp are modified simultaneously, the amido of dopamine and the carbonyl of n-vinyl pyrrolidone can react to produce a frame structure similar to network channels, the frame structure has an ordered open pore channel and a core-shell structure, the specific surface area of the material is obviously improved, and correspondingly, the characteristics can obviously improve the effects of selectivity, strong adsorption, efficient enrichment, rapid separation and cyclic utilization of the material on pesticide residues. The experimental results also show that the composite structure modification can obviously improve the dispersion performance, the magnetic performance and the adsorption performance of the magnetic material to pesticides with different properties, and obviously improve the adsorption capacity of the material to various pesticides with different properties.
The present invention is not limited to the above-described preferred embodiments, and any structural changes or process modifications made in the light of the present invention shall be construed as being within the scope of the present invention, and all technical solutions similar or equivalent to the present invention shall be construed as being included in the present invention.
Claims (1)
1. The method for accurately detecting the pesticide residue in the fruits is characterized by comprising the following steps of:
(1) Homogenizing 20g of apples with a homogenizer at 9500 rpm for 1 minute to obtain a slurry; taking 5g of slurry in a 50mL centrifuge tube with a plug, then adding 20mL deionized water and 2mL acetonitrile, and shaking at 1800 rpm for 2 minutes;
(2) Adding 50mg of magnetic nano material into the centrifuge tube with the plug in the step (1), and continuing shaking at 1800 rpm for 4 minutes;
(3) Placing a magnet on the side wall of a centrifuge tube, fully adsorbing the pesticide in the fruit by the magnetic nano material, adsorbing the magnetic nano material with magnetism on the side wall close to the magnet, discarding the mixed solution of the fruit, acetonitrile and water, cleaning the magnetic nano material for 3 times by 2mL of deionized water each time, and discarding the cleaning solution;
(4) Carrying out ultrasonic elution on the magnetic nano material in the centrifuge tube with the plug by adopting 4mL of organic solvent for 8 minutes under the conditions of ultrasonic power of 300W and ultrasonic frequency of 25kHz, eluting the pesticide adsorbed by the magnetic nano particles into the organic solvent, adding 200mg of anhydrous sodium sulfate for dehydration, and then concentrating the eluent to 1mL on an automatic concentrator; wherein the organic solvent is acetonitrile/methanol in a volume ratio of 3: 1;
(5) Adding an internal standard 2,4', 5-tribromobiphenyl solution which is equivalent to 0.20mg/kg of a sample to obtain a solution to be detected;
(6) Loading the fruit to be tested, analyzing the liquid to be tested by using a gas chromatograph-mass spectrometer, and performing qualitative and quantitative calculation by using an internal standard working curve method to obtain an accurate determination result of the pesticide residue in the fruit;
the magnetic nano material is Fe3O4@SiO2@ PDA @ StVp, the specific synthesis process is as follows:
s1, weighing dopamine hydrochloride and Tris buffer solution with the molar concentration of 10mM, and mixing the solution at a solid-to-liquid ratio of 1: mixing at 0.8 mg/mL;
s2 weighing Fe3O4@SiO2Magnetic nanospheres, according to Fe3O4@SiO2And the dopamine hydrochloride Tris buffer solution in a mass ratio of 1:4 ratio of Fe3O4@SiO2In the above-mentioned solution;
s3, weighing n-vinyl pyrrolidone according to Fe3O4@SiO2And n-vinylpyrrolidone in a mass ratio of 1:3 is added;
s4, weighing styrene according to Fe3O4@SiO2And styrene in a mass ratio of 1:1 is added;
s5, stirring the solution at 30 ℃ at 300 revolutions per minute for 1 hour; then reacting for 8 hours at the temperature of 80 ℃;
s6, after the reaction is finished, centrifuging the reaction solution at 2000 rpm for 15 minutes, and collecting a bottom solid;
s7, respectively washing the bottom solid by using absolute ethyl alcohol with the weight 50 times that of the bottom solid and deionized water with the weight 100 times that of the bottom solid;
s8, drying the solid for 6 hours at the temperature of 50 ℃ and the vacuum degree of 0.09MPa to obtain the Fe3O4@SiO2@ PDA @ StVp magnetic nanomaterial.
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| CN101154493A (en) * | 2007-08-29 | 2008-04-02 | 武汉麦迪凯生物技术有限公司 | Superparamagnetism microsphere and method for manufacturing the same |
| CN108620048A (en) * | 2018-05-25 | 2018-10-09 | 天津大学 | The amine-modified magnetic microsphere preparation method and application of polyethyleneimine |
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| CN108620048A (en) * | 2018-05-25 | 2018-10-09 | 天津大学 | The amine-modified magnetic microsphere preparation method and application of polyethyleneimine |
| CN108918736A (en) * | 2018-08-08 | 2018-11-30 | 上海谱实生态环境科技有限公司 | Using Magnetic solid phases abstraction technique to the detection method of fruit, vegetable pesticide residue |
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